package com.tedu.api;

import org.junit.Test;

import java.util.Locale;

public class 作业 {
    //1.输出字符串"HelloJava"的字符串长度
    @Test
    public void testLength() {
        String str = "HelloJava";
        System.out.println(str.length());
    }
    //2.输出"HelloJava"中o的位置
    @Test
    public void testIndexOf() {
        String str = "HelloJava";
        int index = str.indexOf("o");
        System.out.println("打印下标位：" + index);
    }
    //3.输出"HelloJava"中下标为5处开始第一次出现以"o"的位置
    @Test
    public void testIndexOf1() {
        String str = "HelloJava";
        int index = str.indexOf("o");
        index = str.indexOf("o", 5);
        System.out.println("指定下标位：" + index);
    }
    //4.截取"HelloJava"中"Hello"并输出
    @Test
    public void testSubString() {
        String url = "HelloJava";
        url = url.substring(0, 5);
        System.out.println("截取子字符串：" + url);
    }
    //5.截取"HelloJava"中"Java"并输出
    @Test
    public void testSubString1() {
        String url = "HelloJava";
        url = url.substring(5, 9);
        System.out.println("截取子字符串：" + url);
    }
    //6.将字符串" Hello "中两边的空白去掉后输出
    @Test
    public void testTrim() {
        String str = " Hello ";
        str = str.trim().toLowerCase();
        System.out.println("去掉空格：" + str);
    }
    //7.输出"HelloJava"中第6个字符"J"
    @Test
    public void testCharAt(){
        String str="HelloJava";
        char c=str.charAt(5);
        System.out.println("获取对应字符："+c);
    }
    //8.将"HelloJava"转换为小写，然后转换为大写
    @Test
    public void testTrim1() {
        String str = "HelloJava";
        str = str.trim().toLowerCase();
        System.out.println(str);
        str=str.trim().toUpperCase();
        System.out.println(str);
    }
}
